This thesis describes one of the first measurements at the CERN LHC -- the world's largest and highest-energy particle collider. The CMS collision data is analyzed, and results in the first measurement of the inclusive b cross section using semileptonic decays at a center of mass energy of 7 TeV.

This thesis describes one of the first measurements made at CERN's Large Hadron Collider, the world's largest and highest-energy particle collider. The method of analysis described in the first part is applied to the first CMS collision data collected after the LHC startup in 2010 and leads to the first experimental result for the inclusive b cross section using semileptonic decays at a center of mass energy of 7 TeV. The second part of the thesis describes the building and testing of the barrel pixel detector; the author herself played an important role in its construction, commissioning and first exploitation.

The CMS collaboration Thesis Award Committee selected this work as the best thesis of the year 2010

Selected by the CERN CMS-Collaboration Award Committee as the best thesis of 2010 Describes both pioneering data analysis and equally pioneering experimental contributions to particle detection Valuable as an overview of the CMS experiment at CERN Includes supplementary material: sn.pub/extras

Inhalt
The CMS Experiment at the LHC.- Heavy Flavor Physics.- Study of the Inclusive Beauty Production.- Results of First Collisions at s = 900 GeV and s = 2.36 TeV.- Preliminary Results of First Collisions at s = 7 TeV.- The CMS Pixel Barrel Detector.- Construction and Commissioning of the CMS Pixel Barrel Detector.